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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=345267
+-->
+<head>
+  <title>Test for Bug 345267</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=345267">Mozilla Bug 345267</a>
+<p id="display">
+ <input id="d1" maxlength="3" value="abcde">
+ <input id="d2" maxlength="3">
+ <input id="d3" maxlength="3">
+ <input id="d4" value="abcdefghijk">
+ <input id="target" value="abcdefghijklm" maxlength="3">
+</p>
+<div id="content" style="display: none">
+ <input id="u1" maxlength="3" value="abcdef">
+ <input id="u2" maxlength="3">
+ <input id="u3" maxlength="3">
+ <input id="u4" value="abcdefghijkl">
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 345267 **/
+SimpleTest.waitForExplicitFinish();
+// Turn off Spatial Navigation to stop if from hijacking "left" keypress event.
+SpecialPowers.pushPrefEnv({"set":[['snav.enabled', false]]}, runTest);
+
+function runTest() {
+  is($("d1").value, "abcde",
+     "Displayed initial value should not be truncated by maxlength");
+  is($("u1").value, "abcdef",
+     "Undisplayed initial value should not be truncated by maxlength");
+
+  $("d2").value = "abcdefg";
+  is($("d2").value, "abcdefg",
+     "Displayed set value should not be truncated by maxlength");
+
+  $("u2").value = "abcdefgh";
+  is($("u2").value, "abcdefgh",
+     "Undisplayed set value should not be truncated by maxlength");
+
+  $("d3").defaultValue = "abcdefghi";
+  is($("d3").value, "abcdefghi",
+     "Displayed set defaultValue should not be truncated by maxlength");
+
+  $("u3").defaultValue = "abcdefghij";
+  is($("u3").value, "abcdefghij",
+     "Undisplayed set defaultValue should not be truncated by maxlength");
+
+  $("d4").maxLength = "3";
+  is($("d4").value, "abcdefghijk",
+     "Displayed: setting maxLength should not truncate existing value");
+
+  $("u4").maxLength = "3";
+  is($("u4").value, "abcdefghijkl",
+     "Undisplayed: setting maxLength should not truncate existing value");
+
+  // Now start the editing tests
+  is($("target").value, "abcdefghijklm", "Test starting state incorrect");
+  $("target").focus();
+  $("target").selectionStart = $("target").selectionEnd = 13;
+  sendKey("back_space");
+  is($("target").value, "abcdefghijkl", "Should only delete one char");
+  sendKey("back_space");
+  is($("target").value, "abcdefghijk", "Should only delete one char again");
+  (function () {
+    SpecialPowers.wrap($("target")).controllers.getControllerForCommand('cmd_undo')
+                         .doCommand('cmd_undo');
+  })();
+  is($("target").value, "abcdefghijklm",
+     "Should be able to undo deletion in the face of maxlength");
+  sendString("nopq");
+  is($("target").value, "abcdefghijklm",
+     "Typing should have no effect when already past maxlength");
+
+  $("target").value = "";
+  sendString("abcde");
+  is($("target").value, "abc", "Typing should be limited by maxlength");
+
+  $("target").value = "";
+  sendString("ad");
+  sendKey("left");
+  sendString("bc");
+  is($("target").value, "abd", "Typing should be limited by maxlength again");
+  SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>
+